FBI Informant File Introduced To Bulger Jury

Prosecutors have introduced James "Whitey" Bulger's FBI informant file to the jury in his racketeering trial.

Bulger is accused of playing a role in 19 killings during the 1970s and `80s while allegedly leading the Winter Hill Gang. Prosecutors say he was an FBI informant for 15 years, providing information on the rival New England Mafia.

Bulger's lawyers deny that. They say he paid several FBI agents so he could be tipped off to investigations.

With the jury out of the courtroom, the defense argued Monday that an agent with the Justice Department's Inspector General's Office shouldn't be allowed to offer an opinion that the file shows that Bulger was an FBI informant.

During the back and forth between the defense and prosecutors, Bulger was heard using an expletive and denying that he was an informant.